Pump Abrasion Kit Check Ball Material Stainless Steel Compatible with Grainger Part Number 2P598 Compatible with Manufacturer Part Number 1 in Metallic PRO series pumps Diaphragm Material Not Applicable Number of Check Balls 4 Number of Diaphragms Not Applicable Number of O-Rings Not Applicable Number of Seals Not Applicable Valve Type Ball Product Type Fluid End Repair Kit Media Intake Pressure (Maximum) 120 psi Compatible with Pump Type Air Operated Double Diaphragm Pump